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• <br />3 - Compare Mountain Region Floods (depths) (already computed <br />see East Salte Creek new Mack calculations) with Southern <br />Plateau Region floods (depths). Select larger of two flood <br />discharges (depths) for each recurrence interval for use as <br />design flood (depths) valves. <br />E. S. C Sub-basin above M. C. 6500' - 7500' (exclude <br />Mountain Region) <br />A = 52.7mi2 (planimetered) Average Elevation = 7000 ft; <br />Flood Reduction Factor 0.5. <br />410 - 59.7 (52. 7)0'709 = 992cfs x 0.5 = 496cfs <br />450 - 89.1 (52. 7)0'709 = 1481cfs x 0.5 = 740cfs <br />4100 <br />= 103 <br />(52. <br />7)0.710 <br />= 1719cfs <br />x 0.5 <br />= 860cfs <br />4500 <br />= 137 <br />(52. <br />7)0.713 <br />= 2314cfs <br />x 0.5 <br />= 1157cfs <br />• <br />E. S. C. Sub-basin Above M. C. 6500' <br />A = 27mi2 (planimetered) <br />410 __ 59'7 (27)0.709 = 618cfs <br />450 = 89.1 (27)0.709 = 922cfs <br />4100 = 103 (27)0.710 = 1069cfs <br />4500 = 137 (27)0.713 = 1436cfs <br /> <br />Peak Discharges for <br />Southern Plateau Recxion <br />410 = 496 + 618 = 1114cfs <br />450 = 740 + 922 = 1662cfs <br />4100 - 860 + 1069 = 1929cfs <br />4500 = 1157 + 1436 = 2593cfs <br />STD Error of Estimate, 8 <br />Average Range <br />47 +58 to -36 <br />50 +62 to -38 <br />53 +66 to -40 <br />65 +84 to -46 <br />Reference: McCain, J. F. and R. D. Jorett <br />Manual for Estimating Flood Characteristics of <br />